Adventure mod does not spawn you in a town and you have to go around helping everbody! 1.7 should be more focused on adventuring and will reward the player more for exploring. Notch is keeping this quiet on this as he wants us and I quote, "We’re keeping the details secret so people can get surprises"... so there you have it. It will however contain pistons and they won't shoot you up in the air like the mod version.